Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 954 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 4 (c) 1 (d) 3
2. 2.🧭 A robot should turn right 45°, but its gyro shows it turned 31°. How many degrees must it turn more to the right?
3. 3.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the black/white cut-off (d) the battery size
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
5. 5.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.True or false: to hear a whistle, use a light sensor. (a) True (b) False
7. 7.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
8. 8.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 3 cm (c) 1 km (d) 340 cm
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
10. 10.🛞 Which way of moving suits this best: “moving under water”? (a) wheels (b) propellers (c) tracks (d) legs
11. 11.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
12. 12.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
13. 13.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
14. 14.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
15. 15.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 13. What is under the sensor? (a) the black line (b) the white floor
17. 17.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a gyro sensor (c) a sound sensor (d) a camera
19. 19.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
20. 20.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
21. 21.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 270°. It turns left 45°, then right 120°, then right 45°. What does the gyro read now (0° to 359°)?
24. 24.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a track (c) a servo (d) a caster wheel
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
27. 27.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
28. 28.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
30. 30.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) wheels (c) propellers (d) legs
31. 31.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spread the weight (d) they spin in the air
32. 32.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
33. 33.🧭 A robot faces north. It does: turn right, turn left. Which way does it face now? (a) east (b) south (c) west (d) north
34. 34.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
37. 37.True or false: “a hospital corridor” suits tracks. (a) True (b) False
38. 38.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) the same direction (d) they do not turn
39. 39.🧭 A robot faces north. It does: turn right, turn left, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
40. 40.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small

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